Automatic step-by-step switch



Oct. 29, 1935; R. NEBELUNG 2,018,864

AUTOMATIC STEP-BY-STEP SWITCH Filed Jan. 2, 1931 Rudolf Nebaluna Patented Oct. 29, 1935 UNITED STATES PATENT OFFICE AUTOMATIC STEP-BY-STEP SWITCH many Application January 2, 1931, Serial No. 506,016 In Germany May 20, 1930 6 Claims.

The invention relates to circuit arrangements for increasing the operating speed of stepping switches, controlled by impulses particularly in telephone systems. The object of the inivention consists in that a multiplication of the impulses generated in a circuit is obtained and employed for increasing the rotary speed of stepping switches. This is achieved in that each received impulse repeatedly influences the magnetic field of the driving magnet.

Two embodiments showing the main features of the invention are shown in the drawing, and their operation is described below.

Fig. 1 shows one form of the invention using a rotary interrupter, and Fig. 2 shows a modification of the invention using a relay interrupter for generating the impulses.

The arrangement is shown in Fig. 1 in which a doubling of the rotary speed of a stepping switch is obtained in that the driving magnet of the switch has two difierentially wound energizing windings DI and D2 connected in parallel and having different numbers of ampere turns. A well known form of constantly rotating interrupter RU is connected in series with the large winding. By the impulses from the interrupter RU, after the closing of the starting contact r, the movement of the stepping switch is efiected.

The circuit arrangement shown in Figs. 1 and 2 is a diagrammatic illustration in well known form. It should be understood that the circuit arrangement may be utilized to operate any of the well known rotary line switches, finder switches or selector switches known to the telephone art. For the purposes of illustration the circuit is shown applied to a rotary line switch the mechanism of which is well known, and one form of which is shown in U. S. Patent No. 1,794,888, issued March 3, 1931 to J. Erickson. The circuits herein are arranged in a form'well known in the telephone art such as in Patent No. 1,855,416, issued April 26, 1932 to A. B. Pruess. In the Erickson patent above referred to the operating magnet is shown at I0. In the present arrangement the magnet having windings DI and D2 would replace the magnet III of the patent and the wipers a, b, c and d correspond to wipers 4, 5, 6 and I of the patent.

When the interrupter just makes contact both the windings conduct current, but, due to the opposing flow of the current in the two energizing windings, only one field corresponding to a single number of ampere turns is created, which attracts with a certain strength, e. g. the strength +2,

(Cl. 179-18) 'f:

the disappearance of the field from strength +2, 16

the armature is dropped upon reaching zero, before it is again attracted by the field in the opposite direction of the strength 2. At each interruption an attraction and release of the armature of the driving magnet is efiected. The '5 stepping switch thus advances two rotary steps for each received impulse.

The arrangement according to Fig. 2 shows a somewhat altered embodiment in which it is avoided that the circuit of one of the two energiz- 20 ing windings is permanently closed. The driving magnet also in this case has two opposing energizing windings DI and D2 which, however,

. have the same ampere turns and therefore generate the same magnetic fields but in opposite directions. In order to obtain an alternative and successive connecting up of the two energizing windings at each received impulse, a. separate switching means is provided in the form of a changeover contact 12 in connection with the relay interrupter RI and R11 which generate the impulses. When an impulse is received, the winding DI is energized in series with relay RI, and generates, e. g. a positive field. Relay RI closes the circuit to relay RII. Relay RII energizes and short-circuits relay RI to cause it to release and at contact r2, winding DI is disconnected and thus the winding D2 is connected to ground. As, however, D2 is an opposing winding, the subsequent result is the reversal of the field, up to now positive, and a change thereof to the negative side. The armature of the driving magnet must, therefore, drop and is immediately attracted by the negative field, maintained by winding D2. In this case also a double stepping operation is therefore obtained by the opposing energizing windings and the change of the active field of magnetic force.

As the operation of such switches is generally well known only a general description of the circuit operation will be given, the above explained operation of the operating magnet having windings DI and D2 being the new feature.

A telephone subscribers line is connected to the leads to the left of each figure and when the receiver on such line is removed a circuit is completed for the line relay R over the line. Relay R energizes to close the above circuit for windings DI and D2 at contact r, and also at its other contacts closes a point in a circuit of test relay P. As is known, the intermittent operation of magnet DID2 causes the movement of wipers a-d over their contacts to select an idle trunk line. When such idle trunk line is reached relay P energizes over a circuit including test' wipers c and d to open the circuit of magnet Dl-DZ, to disconnect relay R, and switch the incoming leads of the subscriber's line through to wipers a and b. The operation of magnet Dl-D2 to step the wipers having been explained above, it is believed that this description of the general circuit operation is sufficient.

What is claimed is:

1. A circuit arrangement for increasing the rotary speed of stepping switches controlled by impulses particularly in telephone systems comprising a driving magnet, means for transmitting impulses to said magnet, and means for causing each impluse received by the magnet to produce two complete operations thereof.

2. In a stepping switch, a magnet for stepping said switch, means for sending impulses to said magnet, and means including two opposing windings on said magnet for causing the magnet to energize twice for each received impulse to step said switch two steps per impulse.

3. In a stepping switch, a magnet, an impulse sender for sending impulses to said magnet, and means for causing each impulse to effect a double operation of said magnet, said means including two opposing windings on said magnet, the first having double the ampere turns of the second,

a permanently closed circuit for the second winding, and a circuit for the first winding including said impulse sender so that the first winding produces a magnetic field in one direction at each impulse and the second winding produces a magnetic field in the opposite direction between impulses.

4. In a stepping switch, a magnet having two opposite windings, a relay interrupter, an impulsing circuit including said interrupter and a changeover contact controlled by said interrupter for successively connecting said two windings to said impulsing circuit, once for each impulse, so that said magnet is operated twice for each impulse transmitted thereto.

5. A circuit arrangement for increasing the rotary speed of stepping switches controlled by impulses particularly in telephone systems comprising a driving magnet, and means for causing each received impulse to produce two complete prising a driving magnet, means for causing each received impulse to produce two complete operations of the driving magnet, said means comprising two opposing energizing windings of said magnet having equal ampere turns, and a switching device alternately connecting up the energizing windings to the impulse circuit.

RUDOLF NEBELUNG.

" cm'rmcm: or common.

Patent No- 2,018,864'. October 29, 1935.

Rudolf Nehelung.

It is hereby certified that error appears in the above nun'bered patent requiring carnation as follows: In the drawing, riguree 1 end 2 ghould appear as shown below instead of as in the patent:

and that the said um" Patent ahould'he read. with thin correction therein thet the name my conform to the record of the one" in the Patent Office.

Signed and lealed this 27th day of April, A. .D. 1937.

LeslieFrazer (Seal) Acting qommiesioner of Peteno s. 

